Facebook Messenger adds app extensions and a bot store

I've decided to post this here rather than in Current News. I'll let our members decide whether these new Facebook features are good or bad.

===========================Facebook Messenger is adding third-party extensions and a new discovery tab in a new effort to make it users’ primary messaging app. A year after the rocky rollout of bots, Messenger is taking another swing with changes focused on making them easier to find and use. The changes, which were announced at Facebook’s F8 developer conference today in San Jose, could give users another reason to look at bots after their underwhelming debut in 2016.